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Murmsk
Samba Member
Joined: February 24, 2019
Posts: 368
Location: Illinois
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 Posted: Mon Apr 15, 2019 7:16 am Post subject: rust primer por15 |
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I bought some POR15 paint system which comes with a spray bottle of etch. The directions say to spray and let soak for a time the rinse with water. Youtube vids show just wiping with a wet cloth.
there are places I would like to prime but are in areas where a full rinse would be a mess. It seems to me that leaving an acidic surface seems like a bad idea for rust reasons but maybe not.
what have others done?
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hitest
Samba Member
Joined: September 30, 2008
Posts: 10296
Location: Prime Meridian, ID
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| Posted: Mon Apr 15, 2019 7:49 am Post subject: Re: rust primer por15 |
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You need to visit the body and paint forums- much more specific help over there. Search: POR 15
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bluebus86
Banned
Joined: September 02, 2010
Posts: 11075
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| Posted: Mon Apr 15, 2019 7:50 am Post subject: Re: rust primer por15 |
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the acid is to be removed, it needs to be removed. the residues from the acid if left under the paint will cause issues. I believe the acid is H3PO4 along with zinc. Acid residues, and unadhered zinc will cause adhesion problems. Acid left behind may generate gas which can lift paint.
Hot water is much more effective at residue removal than cold.
Use of degreaser prior to metal prep applications is required. greasy residues will prevent the acid from working as expected.
Bug On!
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tspot100
Samba Member
Joined: March 26, 2006
Posts: 464
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| Posted: Mon Apr 15, 2019 12:01 pm Post subject: Re: rust primer por15 |
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| i use ospho. no need to rinse . great for all rust. have done all my pans etc before applying por-15 many years ago and still looks great. |
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volksworld
Samba Member
Joined: November 26, 2011
Posts: 2529
Location: formerly NY currently NC
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| Posted: Tue Apr 16, 2019 4:43 pm Post subject: Re: rust primer por15 |
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| the problem with por 15 is that it wont adhere to a shiny clean metal surface...thats why they tell you to put it directly onto a rusty surface once you wire brush off the loose stuff....the acid etch is to provide some "tooth" for the paint to adhere to...and supposedly a little surface rust from the water cleanup helps....if you believe them...i'm sure you can neutralize the acid with wet rags( and repetedly rinsing them thoroughly), but it'll take a whole lot longer than just flushing it with a hose |
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johneliot
Samba Member
Joined: August 29, 2005
Posts: 2189
Location: Chico, CA
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| Posted: Tue Apr 16, 2019 6:17 pm Post subject: Re: rust primer por15 |
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I really like Master Series. I've used both and much prefer Master Series.
http://www.masterseriesct.com
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Tom K.
Samba Member
Joined: March 10, 2005
Posts: 1605
Location: Central Pennsylvania
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| Posted: Tue Apr 16, 2019 8:34 pm Post subject: Re: rust primer por15 |
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I'm going to use Master Series too on my current project. Funny that POR15 is so revered on this forum yet so criticized as crap over on the bus/van forums. POR15 seems like a pain in the butt to me - need a rusty surface, have to cover it to protect from UV, etc. And the whole idea of *encapsulating* rust just seems wrong to me - especially on a van. I prefer to first *convert* that rust with OSPHO and then cover the clean metal with something like Master Series. But, hey, arguing over paint systems never gets old.
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73SlowBug
Samba Member
Joined: November 28, 2017
Posts: 439
Location: PENNSYLVANIA
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| Posted: Tue Apr 16, 2019 8:44 pm Post subject: Re: rust primer por15 |
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| Tom K. wrote: |
| I'm going to use Master Series too on my current project. Funny that POR15 is so revered on this forum yet so criticized as crap over on the bus/van forums. POR15 seems like a pain in the butt to me - need a rusty surface, have to cover it to protect from UV, etc. And the whole idea of *encapsulating* rust just seems wrong to me - especially on a van. I prefer to first *convert* that rust with OSPHO and then cover the clean metal with something like Master Series. But, hey, arguing over paint systems never gets old. |
If you get the kit, por15 comes.with a rust converter. You degrease, convert the rust, then topcoat. In my opinion, it's great stuff. I also have used total.boat rust converter as well. I recommend both. No sign of rust coming back on my floor pans or heater channel after use. And my floor pans were awful before i converted and patched, and painted.
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beanlover
Samba Member
Joined: December 18, 2018
Posts: 370
Location: PA
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| Posted: Mon Apr 22, 2019 1:30 pm Post subject: Re: rust primer por15 |
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| Tom K. wrote: |
| I'm going to use Master Series too on my current project. |
+1 from me as well...I saw POR-15 first but then saw the ad on here for Masterseries and looked into both...I'm convinced that Masterseries is the one I want for long term rust proofing of my chassis and body. I live near Pittsburgh, PA and one of the "claims to fame" for Masterseries is that it was applied on a bridge here in Pittsburgh (see here for their write up of it). If it can protect a bridge that well (which gets multiple coatings per winter of whatever ice/snow melting stuff they put on the roads here) then I'm sure it can protect my "precious" for at least as long if not longer with vigilance from me making sure to fix problem spots along the way. |
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